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[2003:d8:2f37:2b00:948c:dd9f:29c8:73f4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b87b38fcfsm53262385e9.0.2025.09.01.07.43.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 07:43:24 -0700 (PDT) Message-ID: Date: Mon, 1 Sep 2025 16:43:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 05/12] KVM: Documentation: describe GUEST_MEMFD_FLAG_NO_DIRECT_MAP To: "Roy, Patrick" Cc: "ackerleytng@google.com" , "Manwaring, Derek" , "Thomson, Jack" , "Kalyazin, Nikita" , "kvm@vger.kernel.org" , "kvmarm@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "pbonzini@redhat.com" , "rppt@kernel.org" , "seanjc@google.com" , "tabba@google.com" , "vbabka@suse.cz" , "will@kernel.org" , "Cali, Marco" References: <786503d6-e58d-412a-a17b-f5e4e481c3fe@redhat.com> <20250901143000.5017-1-roypat@amazon.co.uk> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250901143000.5017-1-roypat@amazon.co.uk> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: JWZpZclfRz89xotNZT1xKNnlstIZRBS6od0mn9fV0Bc_1756737805 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 55DFA100015 X-Stat-Signature: 8msy3qqjnb7r5xe1cccwy1ybniy6o4ss X-Rspam-User: X-HE-Tag: 1756737808-351719 X-HE-Meta: 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 rdX6H4Er /3qYqJJkw+ZgST+44bhVVdl5vrzb+0a5rlSij10P2J51xYhYj3TGFhXdK3mHUncQMR9VMw9RhhhPfR8C+aXZ8kRkhzGjnTfRLZSeckPmvmidYTmLJ+rn4Wqs0N1WO6RHR+jAzcKGWb4MFfQMOIe+WCkK8gf9x2/xuBN269wQBmXkKI5Qma0Sg6PZvWSwK75/zU9iKb5X2Ijm3ql4MXEfsjuWgYrky9aze3YX3eVFzVof8HV1JfCfxHrk0FQ5uSIdAESlwlcx2K5RdYqo+LoHDq0MuDzjd0dzRbY8zd7yOF/M5JbZLN6V2vAOe+8FAbxiVBqJIpDtAmMtB1jLDOkq3159ipUmCf/RxkNwkfDxaZPdRcjlrfKesm106ItMvSTEWd9FpJ+N5yqZAT2PoivelKnQFiIbvct66AU+JfXOY2+hi4+5vgoCNaXCvvFuIZnYYQm+dkia41lkpyDgoczjeqo9GZji/J/NMpw/NwjWLxIwhDD5ACBSzx1jcdwEq2JBfp9OlyOUxdgAzv94h7lJYCfbY7R0nuGSMr7pkKSJ0DuZEa6EF4xbMSEzOKyigawJEoJe3d+7h+XwkbBjHLunho5wMOBZCk/u+IW2HePS/uBAVWm6S96OGgqhFO5WvW+6504uJno0/mldvQ5XKunq1pGWgVsmrGLCd5g9pJmEkmZUM3ozQYX7+EbD2WS2lj/wySFVkKI4LxijTssw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 01.09.25 16:30, Roy, Patrick wrote: > On Thu, 2025-08-28 at 11:27 +0100, David Hildenbrand wrote: >> On 28.08.25 11:39, Roy, Patrick wrote: >>> Signed-off-by: Patrick Roy >>> --- >>> Documentation/virt/kvm/api.rst | 5 +++++ >>> 1 file changed, 5 insertions(+) >>> >>> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst >>> index c17a87a0a5ac..b52c14d58798 100644 >>> --- a/Documentation/virt/kvm/api.rst >>> +++ b/Documentation/virt/kvm/api.rst >>> @@ -6418,6 +6418,11 @@ When the capability KVM_CAP_GUEST_MEMFD_MMAP is supported, the 'flags' field >>> supports GUEST_MEMFD_FLAG_MMAP. Setting this flag on guest_memfd creation >>> enables mmap() and faulting of guest_memfd memory to host userspace. >>> >>> +When the capability KVM_CAP_GMEM_NO_DIRECT_MAP is supported, the 'flags' field >>> +supports GUEST_MEMFG_FLAG_NO_DIRECT_MAP. Setting this flag makes the guest_memfd >>> +instance behave similarly to memfd_secret, and unmaps the memory backing it from >>> +the kernel's address space after allocation. >>> + >>> When the KVM MMU performs a PFN lookup to service a guest fault and the backing >>> guest_memfd has the GUEST_MEMFD_FLAG_MMAP set, then the fault will always be >>> consumed from guest_memfd, regardless of whether it is a shared or a private >> >> WARNING: Missing commit description - Add an appropriate one > > Admittedly wasn't sure what to say that wouldn't just repeat the commit title > or the contents. Maybe that just means this shouldn't be its own patch. Will > squash in the previous one (same for PATCH 11/12). Very right :) If there is nothing to say then probably everything was already said (other patch), lol > >> WARNING: From:/Signed-off-by: email name mismatch: 'From: "Roy, Patrick" >> ' != 'Signed-off-by: Patrick Roy ' > > Heh, my git config only ever uses "Patrick Roy ". Not sure > where "Roy, Patrick" comes from, could it be the mail server mangling things? Good question. Does it only happen through git? When Nikita sends through amazon.com[1] it seems to be fine. But when he also sent through amazon.co.uk [2], it's also messed up. I suggest contacting the amazon.co.uk admin or ... sending through amazon.com :) [1] https://lore.kernel.org/all/cda7c46b-c474-48f4-b703-e2f988470f3b@amazon.com/T/#u [1] https://lore.kernel.org/all/20250828153049.3922-1-kalyazin@amazon.com/T/#u -- Cheers David / dhildenb